“Corporate America and the billionaire class have been waging a 40-year war against the trade union movement in America that has caused devastating harm to the middle class in terms of lower wages, fewer benefits and frozen pensions,” Sanders said in a statement.

“That war will come to an end when I am president. If we are serious about rebuilding the middle class in America, we have got to rebuild, strengthen and expand the trade union movement in America.”

Sanders's plan works to cement his backing of the labor movement as he seeks to shore up support among the Democratic Party’s progressive flank and claw higher in polls of the crowded presidential primary field.

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The proposal would allow the National Labor Relations Board to certify a union if a majority of eligible workers consent and enact “first contract” provisions that mandate employers to begin negotiating within 10 days of receiving a request from a new union and lay out a mediation process.

Sanders also calls for the end of “at will” employment, which would require employers to provide a “just cause” for terminating an employee, legalizing the right of federal workers to strike and instituting a “sectoral collective bargaining” system that would let labor and management negotiate standards for entire industries rather than individual companies.

The plan goes on to propose a federal law guaranteeing the right of public employees to organize and collectively bargain, a requirement that merging companies honor existing union contracts and the implementation of a “fair transition” to Sanders’s “Medicare for All” health care plan, among other initiatives.

Sanders said that should Medicare for All be signed into law, companies with union-negotiated health care plans would be required to enter into new contract negotiations and any company savings from reduced health care contributions would make their way to workers in the form of increased wages or other benefits.